ANISOTROPY OF THE ELECTRON LANDE G-FACTOR IN QUANTUM-WELLS

The pulsation measurement of electron spin quantum beats by time resol ved photoluminescence in a magnetic field perpendicular or at 45 degre es to the growth axis yields the transverse and longitudinal component s of the electron Lande g factor in GaAs quantum wells (QW). The aniso tropy of the g factor is thus determined as a function of the well wid th. No difference is found between the components of the g factor para llel and perpendicular to the growth axis for a 12 nm wide QW, whereas a clear anisotropy is measured for narrower QW.